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Engine max RPM
#1285155 Sun Oct 28 2018 02:37 AM
Joined: Jul 2018
Posts: 160
M
Jolly Roger
Now that I’ve gotten the engine running to factory standards, the question of overrev comes into play. I know it doesn’t have a governor but it also isn’t VVT so overrev wouldn’t hurt more than the bearings over a long period. I know the highway going 45 cruising RPM is something like 3500-3800. What I want to know is what will the engine run at with full throttle in neutral and what would be considered red lining it. Also how much damage would be done to it if it is ran at full throttle for a few seconds.


Owner of the most temperamental 1951 3100 in existence
Re: Engine max RPM
Mr. Dane #1285159 Sun Oct 28 2018 02:49 AM
Joined: Feb 2004
Posts: 21,250
H
Boltergeist
Running full throttle at no load is a surefire way to do major damage to the rod bearings of any engine. If you're running a 216 with cast iron pistons, that's a very good way to hammer the Babbit bearings into nothing in a very short time. The engine will run pretty much forever at 3500 or a little more as long as it's done while pulling the vehicle. Revving it up in neutral is an exercise in stupidity.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Engine max RPM
Mr. Dane #1285173 Sun Oct 28 2018 06:52 AM
Joined: Feb 2001
Posts: 1,141
D
Shop Shark
Mr Dane has a '54 235 in his 1/2 ton . Great engine .

but 3800rpm at 45mph ??? need a new rev counter .

RPM Calculator; http://www.csgnetwork.com/multirpmcalc.html

Re: Engine max RPM
Mr. Dane #1285188 Sun Oct 28 2018 01:20 PM
Joined: Sep 2001
Posts: 30,581
ace skiver
Maybe in 2nd gear with the heavy duty 3-speed (3.90 rear) = ~3800 rpm


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Engine max RPM
Dusty #1285230 Sun Oct 28 2018 07:57 PM
Joined: Jul 2018
Posts: 160
M
Jolly Roger
i dont think its hitting 3800 thats just what i saw in another form post. i need a rev counter as it stands lol


Owner of the most temperamental 1951 3100 in existence
Re: Engine max RPM
tclederman #1285231 Sun Oct 28 2018 07:58 PM
Joined: Jul 2018
Posts: 160
M
Jolly Roger
its just got a stock 4.11:1 that came on the 1/2 tons.. so from what ive read on other sites it could be somewhere from 3200-3800. either way thats a pretty good running speed..


Owner of the most temperamental 1951 3100 in existence
Re: Engine max RPM
Hotrod Lincoln #1285232 Sun Oct 28 2018 08:03 PM
Joined: Jul 2018
Posts: 160
M
Jolly Roger
hopefully that'll never happen. ill just make sure im the only one that drives it.


Owner of the most temperamental 1951 3100 in existence
Re: Engine max RPM
Mr. Dane #1285233 Sun Oct 28 2018 08:04 PM
Joined: Jul 2018
Posts: 160
M
Jolly Roger
anyway ive found what im looking for thank you all for the help!


Owner of the most temperamental 1951 3100 in existence
Re: Engine max RPM
Mr. Dane #1285962 Sat Nov 03 2018 09:08 PM
Joined: Jun 2012
Posts: 1,729
S
Shop Shark
Standard 1/2 ton? Stock trans ans rear end? And a 235? That is the same setup I have in my 52. With a decent tach on the column I read 3000 RPM at 60 MPH. 235 15 tires and wheels. So, try to get a good reading on the engine RPM. My truck sounds "busy" at 2500/2700 RPM(that is close to 55 MPH) so I do tend to stay right around that speed. It will go as fast as 65, but neither me or the truck feel real happy for long at that speed. I do some "freeway" driving. Not avoidable in Utah, but I don't go far from the right hand lane. Hot Rod thinks 3500 is fine. Trust him. Here is one, kinda spendy but a good counter: https://www.autometer.com/2-5-8-tach-4-000-rpm-low-rev-black.html


Steve H
Re: Engine max RPM
Mr. Dane #1285970 Sat Nov 03 2018 10:12 PM
Joined: Feb 2004
Posts: 21,250
H
Boltergeist
235's from 54-62 were factory max HP rated at speeds from 3800-4200, depending on the year of the engine. With good rod bearings and good oil pressure, these engines will stay together and produce more HP than most of us will ever need at speeds we're afraid to approach. If an engine is noisy at lower speeds, it's either worn out, or we're just not accustomed to hearing one earning its keep at its HP-rated RPM. The bigger trucks with plenty of gears got run at or near redline pulling max loads or above all day and stayed together.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

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